Minecraft Pocket Edition Package?

I wanted to buy the following package for my Minecraft on the iPad. If it is available in the shop from the "developers" in the Pocket Edition, does it also work in the Pocket Edition?

And can you then use it in worlds that you already have?

I know the question may be stupid, but I really don't know my way around 😂

Here is a picture

This is a whole new world, which means that you can use it again and again, but you can't add it to another

If it's a resource / behavior package, it should go

If it's one world I'm not sure, but it should work anyway (by copying the package from one world to another)